removal possible?

[h4X6]

hey all

looking to modify my intake a bit so i am hoping i can remove some lines and valves.... just wondering if its possible or not... take a look at the pics and let me know, and how to do it...






i want to remove everything that is circled... i know ill lose my IACV which is fine... but that one valve under the throttle body is what i am wondering...

thoughts?

[bobbo]

Do you drive your car in cold weather? You can by pass your IACV "apparently". There are some people who have done it.

[h4X6]

Yea I do but rarely. Will be parked this winter so

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[h4X6]

no body

[bobbo]

All it's there for is to help with cold starts. There is another circuit which helps with compensating with AC and PS loads (AAC Valve).
You can bypass your IACV system just make sure you're not interfering with another circuit and you don't create any vacuum leaks.

[G-E]

Yea you have one valve for cold starts and one for fast idle, they serve different functions, you have to decide if you want those.. luckily they don't hurt performance to keep

[h4X6]

So I can remove them and not have any real issues. Nothing bad for emissions at all?

Like I said. Making changes the to the intake so that one nipple will be gone from the intake cold pipe hence why I want to remove it instead of trying to get someone to weld a new bung/nipple.


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[gtrjon]

the real question is WHY?

[h4X6]

Like I said... the bung that allows the air to get to those valves will be removed. Its just the way I am doing the intake, if i could get someone to weld a bung in for cheap I would but aluminum welding ain't cheap and I don't want to spend a butt load of money on something so meaningless.

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[Skym]

IACV is basically a automatic choke. On Early 80's Nissan's they had a manual choke (knob on dash) that you press in a little bit at a time while engine warms up.

The IACV is there to provide more air to intake plenum (on top of what AACV provides) when throttle plate inside throttlebody is closed. It's there because ECU runs engine rich, raises idle rpm and engine needs more air to match. As engine warms up (ECU runs engine leaner, drops idle rpm) the IACV closes (heat from engine + voltage to IACV) to provide less air to intake plenum.

If you remove IACV, have to keep throttle plate inside throttlebody open while engine warms up. It's not worth it to remove IACV.